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There is something that people used to build in the olden days called a crystal radio. Out on the farms, they didn't have electricity and they couldn't afford batteries, so they found a way of listening to the radio without plugging anything in. Essentially, they were absorbing power from the transmitting station to drive their little earphone speaker. If ...


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Say an atom just emitted a photon by an electron falling back from an excited state to its grounstate it would make sense this photon can interact readily with another atom of the same element in the groundstate bringing it up to that excited state. The energy lost by the first atom and gained by the second is the same.


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The question is not entirely precise but I can at least clarify that photons emitted by one atom can be absorbed by another atom, even if those atoms are moving at different speeds. The likelihood of excitation is simply maximized when the atoms have the same velocity. In general, the law which states that transitions are only possible between initial and ...


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To simplify we can treat the wire as perfectly taut. This allows the rope to exert a force on the tight rope walker (TRW) Also for simplicity imagine the TRW as a solid body with a solid body pole that can be rotated about an axis parallel to the rope at a fixed location relative to the TRW. Now, if the TRW is tipping clockwise their center of gravity ...



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